Electric alarm



(No Model.) S. T. SANDERS.

ELEGTRIG ALARM.

Patented Peb. 13, 1894.

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UivrTnD STATES PATENT Genion.

SAMUEL T. SANDERS, OF GRANITE, MONTANA.

ELECTRIC ALARM.

PECFXCATION forming part of Letters Patent No. 514,775, dated February 13, 1894- Application tiled July 29, 1893. Serial No. 4811851. (No model.)

To all whom t may concern.-

Be it known that I, SAMUEL T. SANDERS, of Granite, in the county of Deer Lodge and State of Montana, have invented a new and Improved Electric Alarm, of which the following is a full, clear, and exact description. i

The object of the invention is toprovide a n ew and improved electric alarm, which is simple and durable in construction, very etfective and automatic in operation, and more especially designed for use in mines, to automatically signal to the engineer the arrival of the cage near a gallery at the time the chairs ofthe said gallery have been moved into the mine shaft to support the cage thereon.

Theinvention consists of an insulated slide connected with the mechanism for operating the chairs in the galleries, conductors held on the said slide and connected with the circuit w1res, and a circuit closing arm on the cage and adapted to engage the said conductors to close the circuit so as to sound the alarm.

The invention also consists of certain parts and details, and combinations of the same, as will behereinafterdescribed and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, 1n which similar letters of reference indicate corresponding` parts in all the figures.

Figure l is a sectional side elevation of a mine with the improvement applied. Fig. 2 1s an enlarged sectional front view of part of the improvement; and Fig. 3 is a cross section ot the same.

In the mine shaft A is mounted to travelin the usual manner the cage B, adapted to be supported by chairs C, at a gallery D, at the time the said chairs are moved from the latter into the mine to form a support for the cage at the gallery. The mechanism E for manipulating the chairs O so as to move the same into or ont of the path ofthe cage B, is of the usual construction, and is connected with a bell crank lever F arranged in one side of the shaft A and connected by a rope or cord G with a slide Il made of a suitable insulated material, such as hard rubber, and itted to slide on inclined guideways I attached to a easing J fastened in a recess in .the mine shaft, as plainly illustrated in the drawings.

On the insulated slide II are secured forwardly-extending conductors K and K projecting forwardly through slots J in the front of the casing J, the said conductors being connected by branch wires L and L respectively with the circuit wires N and N connected with an alarm O and battery P of which the former is located in the engineers room. The plates K and K are adapted to be engaged by a circuit closing arm or bar Q attached to the cage B, so that when the said circuit closer moves in contact with the said conductors K and K', the circuit is closed and the alarm O is sounded in the engineers room at the time the cage nears the gallery D and at the time the chairs C are drawn into the mine shaft to form a support for the descending cage.

The slide Il is connected at its upper end by a link R with a weighted lever S fulcrumed on the casing J, as plainly shown in the drawings. This weighted lever S holds the slide I-I in a normal uppermost posit-ion so that the conductors K and K are withdrawn within the casing J, as indicated in dotted lines in Fig. 3, so that the said conductors are not in the path ot the circuit closing bar Q, when the latter ascends or descends with the cage B. The lever S holds the slide II in this position as long as the chairs C are in their normal position within the gallery D, but when the mechanism E is actuated to throw the chairs C into the mine shaft A to form asupport for the descending cage, then the said mechanism E actuates the bell cranklever F to exert a pull on the rod G whereby the slide I-I is caused to slide downward and outward on the inclined guideways I to move the conductors K and K in the path of the bar Qon the descending cage B. Now, when the latter in its downward course moves its bar Q, in contact with the said conductors K and K', the circuit is closed, and an alarm is sounded on the alarm O, thus giving a signal to the engineer that the cage is nearing the chairs G at the mine gallery D. The engineer can thus manipulate the engine so as to stop the cage in time, and to let the latter onto the chairs easily.

When the cage has been loaded or unloaded and again descends, then the mechanism Eis IOC) again actuated by an operator to move the chairs C out of the mine shaft A, and by this operation the bell crank lever F is thrown back to its normal position to permit the Weighted lever S to draw the slide I-I back to its former uppermost position and move the conductors K and K Within the casing J and out of the path of the circuit closing bar Q.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. An electric alarm comprising` an insu lated slide connected With the mechanism for operating the chairs for the mine shaft, conductors held on the said slide and connected with the circuit Wires, and a circuit closing bar held on the cage and adapted to engage the said conductors to close the circuit to sound the alarm, substantially as shown and described.

2. An electric alarm comprising a casing setin the Wall in the mine shaft above a mine gallery, inclined guideways held in the said casing, an insulated slide fitted to slide on the said guideways and provided with conductors, means for connecting the said slide with the mechanism for operating the chairs in the mine gallery below, and a circuit closing bar held on the cage and adapted to engage the said conductors to close the circuit to sound the alarm, substantially as shown and described. z

3. An electric alarm comprisinga casing set in the Wall in the mine shaft above a mine gallery, inclined guideways held in the said casing, an insulated slide iitted to slide on the said guideways and provided with conductors, means for connecting the said slide with the mechanism for operating the chairs in -the mine gallery below, a circuit closing barheld ou the cage and adapted to engage the said conductors to close the circuit to sound the alarm, and means, substantially as described, l

for moving the said insulated plate back into its normal position to move the conductors thereon out of the path of the said circuit closing bar, substantially as shown and described.

SAMUEL T. SANDERS. Witnesses:

M. BLoNGER, A. D. MARSHALL. 

